JP2008111770A - Measurement display method and machine equipped with measuring display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a measurement display method and device which make a guidance for measurement procedures diagrammatically, and can display also progress information representing up to what stage measurement operation has progressed, and a machine equipped with the measuring display device. <P>SOLUTION: If "hole measurement" is instructed as the kind of measurement from a display section 45, when the center position of a hole of a work piece 7 is acquired with manual actuation by the use of a measurement head 3 in an NC machine tool 1, measurement operation processes for the hole measurement are displayed on the display section 45 by working of a measurement operation process controller 21. When a worker performs measurement operation being guided by arrows of the measurement operation processes, the colors of arrows for finished measurement operation processes change successively by working of a measurement result controller 31. The worker can learn which measurement operation process the worker should perform by the changes in color of the arrows. A calculation part 41 calculates the center position of the hole from measurement values of the coordinates of each position acquired at each measurement operation process, and sends its values out to the display section 45. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a machine tool, a tool presetter, a three-dimensional measuring machine, and the like provided with a measurement display method and a measurement display device that measure and display the position coordinates or dimensions of an object to be measured such as a workpiece or a tool.

  In some cases, a measuring head is mounted on the spindle of a machine tool to measure the position coordinates such as the center of the hole and the intersection of the two sides of the corner, and the dimensions such as the diameter and groove width of the hole of the workpiece. In some cases, a measuring head is mounted on the table, and the length and diameter of the tool mounted on the spindle are measured. Using a measuring head, the tool length and tool diameter may be measured with a tool presetter, or the dimensions of the object to be measured may be measured with a three-dimensional measuring machine.

  A conventional measurement operation will be described by taking as an example a case where a touch probe type measurement head is mounted on the spindle of a machine tool and the center position of a hole in the workpiece is measured. When moving the probe of the measuring head to the cross inside the hole, first position the probe near the first measurement point, and then approach the probe in the negative direction of the X-axis to make contact with the workpiece. The X-axis coordinate position of the first measurement point is read by the position reading means. Next, only the X axis is moved in the plus direction so as not to move in the Y axis direction, the probe is positioned near the second measurement point, and then approached in the plus direction of the X axis from there, the second measurement point Read the coordinate position of the X axis. Next, positioning is performed in the vicinity of the third measurement point, and from there, an approach operation is performed in the negative direction of the Y-axis to read the coordinate position of the third measurement point on the Y-axis. Next, only the Y axis is moved in the plus direction so as not to move in the X axis direction, the probe is positioned in the vicinity of the fourth measurement point, and then approached in the plus direction of the Y axis from there to perform the Y measurement at the fourth measurement point. Read the axis coordinate position. The center position of the hole of the workpiece is obtained by calculating the position of the midpoint of the first and second measurement points in the X-axis direction and the position of the midpoint of the third and fourth measurement points in the Y-axis direction. . This measurement operation can be performed manually in an NC machine tool, or can be performed fully automatically if a measurement program is prepared in advance. This measurement operation can also be performed by a so-called general-purpose machine tool that manually moves the feed shaft.

  Patent Document 1 discloses a workpiece measuring device for a machine tool that measures the position and dimensions of a workpiece machined by a machine tool on the machine tool and displays the measurement result. Patent Document 2 discloses a tool setup device that connects a personal computer and a tool presetter to display a preset instruction procedure corresponding to a tool type on a display means. In Patent Document 3, as shown in FIG. 1, a procedure guide screen is displayed in which a procedure for measuring a tool in contact with a touch sensor is displayed in text, and the beginning of a procedure to be performed is flashed to teach. A numerically controlled machine tool is disclosed.

JP-A-2-65949 Japanese Patent No. 2858751 Japanese Patent Laid-Open No. 61-249247

  In the above-described conventional measurement of the center position of the hole, the operator must memorize and discriminate the number of the four measurement points to be measured, which is inconvenient. . In the case of full-automatic measurement, if an alarm occurs during a measurement and is interrupted, it may not be immediately known at which measurement stage the measurement was stopped.

  In the prior art of Patent Document 1, the measurement point coordinates and measurement results are displayed on the display device as numbers. However, there is a graphical display of where to measure and a progress display of whether measurement has been performed or not yet measured. Not. In the prior art of Patent Document 2, the measurement result is displayed together with the figure of the object to be measured, but the guidance display by the figure of where to measure and the progress display of whether the measurement has been performed or not yet measured are not performed. In the prior art of Patent Document 3, the procedure to be measured is displayed in text, or the procedure to be performed next is taught by blinking the cursor, but there is no graphical display of where to measure. There is still inconvenience.

  The purpose of the present invention is to display the measurement operation process by graphic or numerical value for each measurement type when measuring the position coordinates and dimensions of the object to be measured, and to guide the measurement procedure in an easy-to-understand manner. Another object is to provide a measurement display method and a machine equipped with a measurement display device that can also display the progress of the measurement.

  In order to achieve the above object, according to the present invention, in a measurement display method for measuring and displaying a desired position coordinate or dimension of a measurement object by relatively moving the measurement head and the measurement object, For each measurement type of the position coordinates or dimensions of the object to be measured, the measurement operation process of the measuring head with respect to the object to be measured is displayed in a graphic or numerical value, and from the detection signal of the measuring head and the position signal of the relative moving body, Every time one measurement operation process for one measurement type is completed, the measurement result of the position coordinates or dimensions by the one measurement operation process is acquired and displayed, and the display of the completed measurement operation process is not completed. There is provided a measurement display method for calculating a desired position coordinate or dimension of an object to be measured after completing all measurement operation steps for one measurement type instead of a display different from the operation step display.

  The measurement operation process of the measurement head for the object to be measured is displayed as a graphic or numerical value, and the display of the measurement operation process changes each time one measurement operation for one measurement type is completed. The operator sees this display and performs the measurement operation.

  Further, according to the present invention, in the machine including the measurement display device that measures and displays a desired position coordinate or dimension of the measurement object by relatively moving the measurement head and the measurement object, the relative movement is performed. A position reading means that reads the current position of the moving body, a measurement operation process control unit that displays the measurement operation process of the measurement head for the measurement object for each measurement type of the position coordinates or dimensions of the measurement object in a graphic or numerical value, Each time one measurement operation step in one measurement type is completed based on the signals from the measurement head and the position reading means, the measurement result of the position coordinate or the dimension by the one measurement operation step is acquired, and one completed measurement operation step is obtained. A measurement result control unit that changes the display of the measurement operation process to a display different from the display of the measurement operation process that has not been completed, and after all measurement operation processes for one measurement type have been completed, A calculation unit for calculating a desired position coordinate or dimension of an object, a measurement operation step sent from the measurement operation step control unit, and a measurement result each time one measurement operation step sent from the measurement result control unit is completed And a measurement operation process whose display has been changed, and a display unit for displaying a desired position coordinate or dimension of an object to be measured sent from the calculation unit, and a measurement display for displaying the progress of the measurement operation. A machine with the apparatus is provided.

  The display unit displays the measurement operation process of the measurement head with respect to the object to be measured as a graphic or a numerical value, and every time one measurement operation process for one measurement type is completed by the function of the measurement result control unit, the measurement operation process is performed. The display changes. Further, the measurement result for each measurement operation process and the desired position coordinates or dimensions of the measurement object in one measurement type are displayed.

  Further, according to the present invention, the measurement operation process control unit includes a storage unit of a measurement operation process display program for displaying the measurement operation process of the measurement head for the measurement object for each measurement type with a mark, a figure, or a symbol. A machine with a measurement display device is provided. On the display unit, the measurement operation process of the measurement head with respect to the object to be measured is displayed as a mark, a figure, or a symbol.

  Further, according to the present invention, the measurement result control unit has, for each measurement type, state determination means for determining whether measurement is in progress, measurement completion after completing all measurement operation steps, or measurement abnormality, and measurement completion If the measurement unit determines that the measurement position is abnormal, the calculation unit calculates the desired position coordinates or dimensions of the object to be measured and displays the figure or numerical value on the display unit. A machine with a measurement display is provided. If there is further measurement abnormality due to the function of the measurement result control unit, the abnormality information is displayed on the display unit to notify the operator.

  According to the present invention, since the measurement operation process of the measurement head with respect to the object to be measured is displayed on the display unit as a graphic or numerical value, it is a guidance for the operator to perform manual measurement, and the measurement work is facilitated. In addition, since the display of the measurement operation process changes each time one measurement operation for one measurement type is completed, it is possible to know which measurement operation should be performed next, without depending on the memory of the operator, Work errors are reduced and work efficiency is increased. In the case of automatic measurement, the display shows immediately which measurement stage is being performed, and the measurement stage when the alarm is stopped by an alarm is immediately known from the change in the display of the measurement operation process on the display device. It is easy to find out. Further, the measurement result of one measurement operation and a desired position coordinate or dimension of the object to be measured are displayed on the display unit, and when it is determined that the measurement is abnormal, the abnormality information is displayed. If the measurement operation process is displayed with a mark, a figure, or a symbol, the display is simple, and the measurement procedure and the progress state become clear at a glance.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a configuration block diagram showing an embodiment of the present invention. Relative feed is given between the measuring head 3 having a contact sensing type measuring element mounted on the spindle of the NC machine tool 1 such as a machining center and the workpiece 7 which is an object to be measured attached to the table 5, and the measuring element 9 By reading the current position of the relative feed when contacting the work 7 by the position reading means 11, the position coordinates and dimensions of a desired portion of the work 7 are measured.

  The relative feed operation of the NC machine tool 1 is controlled via the interpolation unit 17 and the servo unit 19 by the NC program data read and interpreted by the NC program reading / interpretation unit 15 of the NC device 13. The NC program includes a machining program and a measurement program. In the case of workpiece measurement by the measurement head 3, the measurement program stored in advance in the measurement program storage means 25 of the measurement operation process control unit 21 is sent to the NC device 13, A measuring operation is performed by the NC machine tool 1. The measurement result acquisition means 35 of the measurement result control unit 31 is connected to the skip signal when the probe 9 of the measurement head 3 contacts the workpiece 7 and the position reading means 11 of the feed axis of the NC machine tool 1 via the NC device 13. The machine coordinates at the time of contact are acquired from the current position data read by. When the acquired machine coordinate data is sent to the display unit 45, the measurement result display means 51 displays on the screen 61 the machine coordinates at the time of contact between the probe 9 and the workpiece 7 as a measurement result. This is the basic signal flow during measurement.

  A procedure for manually obtaining the center position of the hole of the workpiece 7 will be described with reference to FIG. 2 showing a screen of the display unit. At the bottom of the screen 61, measurement type buttons 63 such as “hole measurement”, “point measurement”, “corner measurement”, “tool length measurement”, and “tool diameter measurement” are displayed by the measurement type display means 47. This screen 61 is made of a touch panel, and a signal is output when a button display or a numerical value is pressed with a finger. When the “hole measurement” button is pressed, the signal is sent to the measurement type selection unit 23 of the measurement operation process control unit 21, and a measurement program for hole measurement is selected from the measurement program storage unit 25. The selected measurement program for hole measurement is sent to the NC device 13. Further, the measurement operation process for hole measurement is called from the measurement operation process display program storage means 27 and is sent to the display unit 45. An area for displaying operation buttons necessary for hole measurement, measurement results, etc. appears on the screen 61 by the measurement operation process display means 49, and the center position of the hole is obtained. A measurement operation step 69 in which four arrows are shown in the up, down, left and right directions is displayed. This arrow represents each measurement operation for bringing the probe 9 of the measuring head 3 into contact with the workpiece 7.

  First, the probe 9 is positioned in the vicinity of the first measurement point 71 by using a manual pulse generator of the NC machine tool 1 or a shaft feed by a jog switch (not shown). Next, when the “−X” button 79 is pressed, the probe 9 automatically approaches the workpiece 7 along the X axis at a predetermined feed speed, and returns to the original position when it contacts the first measurement point 71. Then, the color of the arrow 87 changes from black to green. This is performed via the display changing unit 39 when the measurement operation analyzing unit 33 of the measurement result control unit 31 analyzes the operation and recognizes that one measurement operation is completed. Various display changing methods such as deleting the arrow instead of changing the color of the arrow or changing the arrow to a blinking display can be adopted. Further, in the measurement result display area 95, the position coordinates of the measurement result are displayed by the functions of the measurement result acquisition unit 35 and the measurement result display unit 51.

  Next, the probe 9 is moved to the left in the X-axis direction using a manual pulse generator so as not to move in the Y-axis direction, and is positioned in the vicinity of the second measurement point 73. Then, the “+ X” button 81 is pressed to measure the position coordinates of the second measurement point 73. Similarly, the color of the arrow 89 changes from black to green. In the case of this manual operation, if it is moved in the Y-axis direction by mistake, the state discriminating means 37 judges that there is an abnormality, and a message “Measurement position is different” appears in the alarm display area 97. Displayed by working. Next, measurement of the third measurement point 75 is performed by pressing the “−Y” button 83, and the color of the arrow 91 changes from black to green. FIG. 2 shows just this measurement stage.

  Even if the operator does not memorize the next measurement operation at the fourth measurement point 77, the operator can immediately check the next measurement by viewing the color change state of the graphic display in the measurement operation step 69 on the screen 61. You know what the action is. Similarly, the measurement of the fourth measurement point 77 is performed by pressing the “+ Y” button 85, and when the measurement operation is completed, the color of the arrow 77 changes from black to green, and the state determination means 37 performs all measurements of one measurement type. It is determined that the operation process is completed, and all measurement result data is sent to the calculation unit 41. Then, the calculation unit 41 calculates the circle center position using the calculation means 43, and the calculation result is displayed in the center position display area 99 of the screen 61 by the operation of the calculation result display means 53. In order to set the center coordinate as the origin of the workpiece coordinate system, a symbol of the workpiece coordinate system is input to the workpiece coordinate system display area 101 and the “set” button 103 is pressed.

  When the center position of the circular boss of the workpiece 7 is obtained, when the “outer circle” button 67 is pressed, the figure of the measurement operation process changes to four arrows from the outside of the circle toward the center. Further, when a line with the measurement result display area 95 is pressed and the “selection data clear” button 105 is pressed, the arrow corresponding to the measurement result changes from green to black, and at the same time, the measurement result is deleted. Then, the measurement operation can be redone. It is also possible to press the “clear all data” button 107 to redo all measurement operations.

  Next, a procedure for manually obtaining the position coordinates of the corner of the workpiece 7 will be described with reference to FIG. 3 showing a screen of the display unit. When the “corner measurement” button is pressed among the measurement type buttons 63 at the bottom of the screen 61, the measurement type selection unit 23 of the measurement operation process control unit 21 selects a measurement program for corner measurement from the measurement program storage unit 25. The data is sent to the NC device 13. In addition, a measurement operation process for corner measurement is called from the measurement operation process display program storage means 27 and sent to the display unit 45, whereby a measurement operation process 111 for corner measurement is displayed on the screen 61. In this case, the arrangement of the “−X” button 129, the “−Y” button 131, the “+ X” button 133, and the “+ Y” button 135 is different from the case of the hole center position measurement. When measuring the position coordinates of the lower left corner, the operator first positions the probe 9 near the position of the arrow 113 and presses the “−X” button 129. Then, the probe 9 approaches the workpiece 7 and returns to the original position when it comes into contact. The color of the arrow 113 on the screen 61 changes from black to green, and the position coordinates at the time of contact are displayed in the measurement result display area 95. The

  Similarly, each position coordinate is measured according to arrows 115, 117, and 119. When the state determination means 37 determines that the four-point measurement operation has been completed, the four-point measurement result data is sent to the calculation section 41, the corner position coordinates are calculated by the calculation means 43, and the calculation result is displayed on the screen 61. And the origin mark 139 is displayed at the lower left corner of the measurement operation step 111. In order to set the corner position as the origin of the workpiece coordinate system, a symbol of the workpiece coordinate system is input to the workpiece coordinate system display area 101 and the “set” button 103 is pressed. If the measurement is continued according to the arrows 121 and 123, the position coordinates of the lower right corner are obtained, and if the measurement is continued according to the arrows 125 and 127, the position coordinates of the upper right and upper left corners are obtained.

  When measuring a width dimension, a step dimension, and a midpoint between two surfaces of the workpiece, the “point measurement” button of the measurement type button 63 is pressed. Then, on the screen 61, the corresponding measurement operation process is displayed with an arrow, and measurement is performed according to the instruction. Although not shown, measurements such as obtaining the diameter of the circle, the angle of the corner, and the X, Y, and Z axis coordinates of the corner position can be performed in the same manner.

  A tool can be mounted on the spindle, a measuring head can be mounted on the table 5, and a measuring element can be brought into contact with the tool from the Z-axis direction, X-axis direction, or Y-axis direction to measure the tool length or the tool diameter. In this case, a “tool length” button or a “tool diameter” button of the measurement type button 63 is used. The measurement operation process is represented by a tool figure and an arrow indicating the direction in which the measuring element is approached, and the operator can perform measurement while looking at the screen in the same procedure as described above.

  In the present embodiment, the arrows are used for displaying the measurement operation process. However, the present invention is not limited to the arrows, and various modifications are possible such as using a small circle representing the sphere at the tip of the probe. Further, instead of the “+ X”, “−X”, “+ Y”, and “−Y” buttons, a modified example in which an approach operation in the direction of the arrow can be performed by pressing an arrow of the measurement operation process, for example, the arrow 87 or 113. Is also possible. Further, instead of the contact sensing type measurement head, a displacement measurement type measurement head may be used, or a non-contact type measurement head may be used.

  Although the NC machine tool has been described in the present embodiment, the present invention can also be applied to a so-called general-purpose machine tool that manually moves the feed shaft. In that case, all of the measurement operations for manually returning the probe to the original position when it touches the workpiece are performed manually. The present invention can also be applied to a tool presetter that attaches and sets a tool to a tool holder so that the length and diameter of a tool to be mounted on an NC machine tool have predetermined values in advance. It can also be applied to a three-dimensional measuring machine that measures typical dimensions. And in these machines, not only manual measurement, but also in the fully automatic measurement process, if there is a measurement display device of the present invention, which measurement stage is currently in, if stopped by an alarm, which Whether it stopped in the measurement stage is displayed graphically with an arrow or the like on the display unit, and the operator can be easily informed of the measurement state. The measurement operation process control unit, the measurement result control unit, the calculation unit, and the display unit may be provided in the NC device, may be provided in the machine control device, or may be provided as a separate personal computer. Good.

It is a block diagram which shows embodiment of the machine provided with the measurement display apparatus of this invention. The screen of the display part in the case of measuring the center position of a hole is shown. The screen of the display part in the case of measuring the position coordinate of a corner is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 NC machine tool 3 Measuring head 7 Workpiece 11 Position reading means 13 NC apparatus 21 Measurement operation process control part 31 Measurement result control part 41 Calculation part 45 Display part 61 Screen 63 Measurement type button 69, 111 Measurement operation process

Claims (4)

In a measurement display method for measuring and displaying a desired position coordinate or dimension of a measurement object by relatively moving the measurement head and the measurement object,
Displays the measurement operation process of the measuring head for the object to be measured for each type of measurement of the position coordinates or dimensions of the object to be measured, with figures or numerical values,
From the detection signal of the measurement head and the position signal of the relatively moving moving body, the measurement result of the position coordinate or the dimension by the one measurement operation step is acquired every time one measurement operation step in one measurement type is completed. And display
Change the display of the completed measurement operation process to a display different from the display of the measurement operation process that has not been completed.
After completing all measurement operation steps in one measurement type, the desired position coordinates or dimensions of the object to be measured are calculated and displayed.
A measurement display method characterized by that. In a machine equipped with a measurement display device for measuring and displaying a desired position coordinate or dimension of a measurement object by relatively moving the measurement head and the measurement object,
Position reading means for reading a current position of the relative moving body;
A measurement operation process control unit that displays the measurement operation process of the measurement head with respect to the object to be measured for each measurement type of the position coordinates or dimensions of the object to be measured, in a graphic or numerical value;
Each time one measurement operation step in one measurement type is completed based on the signals of the measurement head and the position reading means, the measurement result of the position coordinate or the dimension by the one measurement operation step is acquired, A measurement result control unit that changes the display of the measurement operation process to a display different from the display of the measurement operation process that has not been completed;
A calculation unit for calculating a desired position coordinate or dimension of the object to be measured after completing all measurement operation steps in one measurement type;
The measurement operation process sent from the measurement operation process control unit, the measurement result and the display operation changed every time one measurement operation process sent from the measurement result control unit is finished, and the calculation unit send A display unit for displaying desired position coordinates or dimensions of the object to be measured;
And a machine equipped with a measurement display device, characterized in that the progress of the measurement operation is displayed.   3. The measurement according to claim 2, wherein the measurement operation process control unit includes a storage unit for a measurement operation process display program for displaying a measurement operation process of the measurement head with respect to an object to be measured for each measurement type with a mark, a figure, or a symbol. A machine with a display device.   The measurement result control unit has state determination means for determining whether measurement is in progress, measurement completion after completion of all measurement operation steps, or measurement abnormality for each measurement type. The desired position coordinate or dimension of the object to be measured is calculated and displayed on the display unit as a graphic or numerical value, and when it is determined that the measurement is abnormal, abnormality information is displayed on the display unit. A machine with a measurement display.

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